public class Car {
    //座位数、排量
    String seats, displacement;

    public Car(String seats, String displacement) {
        this.seats = seats;
        this.displacement = displacement;
    }

    //启动、刹车
    public void start() {
        System.out.println("启动");
    }

    public void stop() {
        System.out.println("刹车");
    }
}